| 摘要 |
The present invention relates to a process for preparing optionally substituted benzyl carbazates of formula (I) wherein each R1 independently represents C1-C4-alkyl, C1-C4-alkoxy, di(C1-C4-alkyl)amino, nitro, halogen, hydroxyl, the group X-R3, wherein X represents O or S and R3 represents straight-chain or branched C1-C4-alkyl, the group COOR4, wherein R4 represents C1-C4-alkyl, the group NR5R6, wherein R5 and R6 independently represent C1-C4-alkyl, or a C3-C6-cycloalkyl group that is optionally substituted by straight-chain or branched C1-C4-alkyl groups, and n is an integer from 0 to 5, by reacting a dialkyl carbonate with an optionally substituted benzyl alcohol in the presence of a catalyst, separating off the resulting reaction mixture from the catalyst, and subsequently reacting the separated reaction mixture with hydrazine hydrate.
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